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Jan. 12 9 1926. 1,569,364

5. E. GETCHELL ELECLI'RIC RELAY Filed 0013. 18, 1925 INVENTOR I 'l I Patented Jan. 12, 1926.

UNITED STATES PATENT OFFICE.

BENJAMIN E. G-ETCHIELL, 0F PLAINVILLE. CONNECTICUT, ASSIGNOE TO TBU'MBULL ELECTRIC MANUFACTURING COMPANY, OF PLAINVILLE, CONNECTICUT, A. COB

PORATION OF CONNECTICUT.

ELECTRIC RELAY! Application filed. October 18, was. se'im No. 869,304.

To all whom it may concern:

Be it known that I, BENJAMIN E. Gn'ron- ELL, a citizen of the United States of America, residing at Plainville, Connecticut, have invented a new and. useful Electric Relay, of which the following is a specification. My invention relates to a construction 1which is sometimes termed an overload re- 'lhe main object is to provide a simple, inexpensive, and reliable construction. other object is to provide a standard type device which can be made of standard parts in different ratings.

Another object is to provide a construction the parts of which can be readily assembled and adjusted according to a definite standard at the factory.

Another object is to so mount the parts tion which is practically fool-proof so that it cannot be tampered with and its rating altered.

The invention in its preferred form is embodied in a cartridge type device in which the body is made of two parts, one of which carries both the resistance member and the automatic circuit opening device which are given a definite an permanent adjustment at the factory. The other art serves merely as a cover which is hel in place by the two terminal caps.

Fig.- 1 is a perspective view of one form of device embodying my invention.

Fig. 2 is a longltudmal sectional view of the same. c 3 is a transverse sectional view on the p ane of the line 3-3 of Fi 2.

Flg. 4 is a plan view of one of t e insulating ody parts with attached conducting members. V

Fig. 5 is an end view of the same.

Fig. 6 is a plan view of the other insulatin% body part.

ig. 7 is an end view of the same.

Fig. 8 is a perspective of a fragment of body members.

made of molded insulation and held to gether by the end ca s 12 and 13 which serves as terminals. intermediate contact member or terminal 14 is secured to the part 10 as will be hereinafter understood.

The resistance or heater member 15 has its opposite ends 16 and 1? electrically connected with the end terminal caps 12 and 18f respectively. As a convenient "means of securing the end caps in place and connecting them to the ends of the heater strip I may provide anchorage blocks 18 and 19 adapted to fit in notches such as 20 and 21 in "the Each anchorage block is provided with an extension'such as 22 and iii? 23 adapted to project through the ends of the heater strip and be spun or riveted over the ends of the terminal members 12 and 13 to permanently unite the parts.

In the preferred form as herein shown the heater strip 15 consists of a wire which is supported on one end of a strip 2 1 being insulated therefrom by a layer of mica 25.

The support M is fastened in place beneath" the head of a screw 25 which screws into a nut 27.

The thermostatic element consists of a bimetallic strip 28 having one end secured to the body part 10 by the screw 26 and the other and engaged by the screw 29. Between the stationary end of the strip 28 and the base of the heatersupport 24, I provide one or more washers 30 or layers of conducting material by which the heat developed by the resistance is transmitted to the thermostatic element 28. By varying the number, thickness, and material of these washers, the time lag of operation may be varied to a considerable extent. The contact screw 29 is seated in a bushing 31 which is used as a rivet to hold the contact 14 in place. When "this contact screw 29 has been adjusted so thatthe relay operates under the desired conditions, a drop of solder or brazing metal 32 is applied tothe end of the contact screw at the face of the bushing 31 so as to permanently connect the parts in the proper relation and to prevent changes being made in the adjustment.

It will be noted that the resistance or til heaters sweat and the thermostatic element t gther.with its, contact'screw are all se curedtoone-half of the body of the relay, theotherr'half 11, of the body merely servh iiheate in'g,'as'a*'cover. 'It is thus possible to assemble and thermostat and inspect and them in full view before the cap is applied .1 'Between the heater and thermo statio'elements I provide a strip of insulating material '33, for instance of asbestos, which fits in the channel of the body and prevents the'heat. from the coil being directly transmitted to the thermostatic strip 28.

assemblingcthe parts, the contact ter- QQ-is riveted to the body part 10 by bushing '31 which carries the contact sttwt gL-Q'lhe thermostatic strip 28 is then aroundf'the tubular extensions 22 and 23 permanently together.

- in place either mounted'ivithin' the body part 10and the necessary heat transmitting washers and charmer strip 24 secured in place by the I I and nut 27.. The anchorage blocks iihdu19 are then located in the notches imthelene of the body part 10 and the lfiia'nd' 17 ofthe heater strip are wound of the anchorage members. The other body part 11 is then laid over the part 10 and theend'caps 12 and 13 slipped on the ends. ass through thQGeaitraIopeningS in the en s of the caps .The members 22 and 23 are theariyetedor spun over to secure the parts i i i The contact screw 29 may be pro erly adjusted and soldered before or after the cover 11 is applied.

(Ii-Will be noted that the operating parts,

' including the adjusting means, are mounted teams taqtascrevr securedtosaid body to cooperate with theme-memes element, an insu ating cover cooperating with the body to enclose said elements, and end caps to hold the body and cover together.

2. An lectric relay comprising an insggating body having a channelled face, a t rmostatic element and a heat conductmg strip-secured to said body and having heat conducting washers therebetween, a contact screw to cooperate with the thermostatic elethe other parts and also ment, a heater element comprisin a wire coiled about said strip but electrica ly insulated therefrom and end portions one of which contacts with said'strip, a cover for the body, and end caps connected to opposite ends of said heater element.

3. An electric relay comprisin lating housing, a thermostatic e ement secured therein, a contact element mounted on the housingto cooperate with said thermostatic element, a heater element comprising a metal strip having an insulatin cover extendin over a portion thereof an a wire connects to the strip and coiled around its insulating cover, and external connections to said heater element.

4. An electric relay comprising two insulating body portions forming a housing, a heater element, a thermostatic element and a contact screw all secured to one of said body portions and covered by the other body portion, and end caps to hold the body portions together.

5. An electric relay comprising an insulating housing, a thermostatic switch element mounted therein and having a movable contact end, a metallic bushing secured in the wall of said housing and having an interiorly threaded passage with a recess in its outer end, a headless contact screw securedin said bushing with its inner end normally in electrical contact with the movable contact end of said thermostatic switch element and with its outer end within said recess and solder in said recess covering the outer end of said screw and securing said screw in its permanently adjusted position in said bushing.

,6. In a relay a housing, a thermostatic switch having a iii-metallic member, a heater support, a heat conducting member of conan insutrolled specific thermal conductivi -inter-' posed between said bi-metallic mom 1' and said support, a heater strip wound on said support and terminals therefor.

In a relay, a housing, a thermostatic switch having a bi-metallic member, a heater support, a plurality of'heat conducting washers interposed between said bi-metallic member and said support, a heater strip pound on said support and terminals there- 8. A relay including an insulating support, appurtenant thermostatic heater and switch 0 ements and. adjustin means all as cured on said support an pre etermined relation, a cover member for said support and end caps for securing said support and said cover member in assembled re ation.

9. A relay construction including an insulating body member, thermostatic heater and switch elements and adjusting means all secured to said body member, an insulating cover memberfor said body member Ill and end caps permanently secured to said the other end of said thermostatic strip, a' body and cover members and to said heater resistance wire coiled about said heater strip 10 element and securing said members togethadjacent said securing member, end caps er as a unit. for said housin and means forconnectin 5 10. A relay comprising a two-part housthe ends of saic? resistance wire to said eng ing, a thermostatic strip, a heater strip, a caps. member for securing one end of each strip to one part of said housing, a contact for BENJALHN .E. 

